Hygrobates (Hygrobatides) dilatatus Smit & Pešić, 2022

K, Harry Smit, Pešić, Vladimir, K & K, Simon Clavier, 2022, Water mites from French Guiana, with the description of 14 new species (Acari: Hydrachnidia), Acarologia 62 (4), pp. 1119-1153 : 1131-1132

Hygrobates (Hygrobatides) dilatatus Smit & Pešić sp. nov.

Zoobank: F8C2A2BE-90AE-4B30-98DD-73331F232C0B

( Figures 8A–D)

Material examined — Holotype female, Crique Aya , National Reserve La Trinité, French Guiana, 4.590557°N, 53.413572°W, 4 Nov. 2018, leg. S. Clavier ( MNHN).

50 µm.

Diagnosis (Male unknown) — The three pairs of acetabula widely separated from each other, first pair at level of postgenital sclerite, posterior two pairs lying far posteriorly; Cxgl-4 not extending far anteriorly; P2 with a blunt anteroventral projection covered by minute denticles.

Description — Female – Idiosoma without plates or platelets, dorsally 810 long and 786 wide, ventrally 846 long. Coxae in three groups, anterior coxae posteriorly pointed. Cxgl-4 near incomplete suture line of Cx-III/IV, posterior to Cx-IV an area of secondary sclerotization ( Figure 8A). Genital field 198 long with three pairs of widely separated acetabula, first pair of acetabula at level of postgenital sclerite; pregenital sclerite 146 wide. Acetabula (partly) surrounded by a small fringe of secondary sclerotization ( Figure 8B). Length of P1-5: 31, 136, 100, 198, 42. P2 anteroventrally with a blunt projected, its tip covered by minute denticles; P3 ventrally and medially with denticles; P4 slender, ventrally with two widely separated setae ( Figure 8C). Length of I-leg-4-6: 182, 178, 116. I-leg-5 anteroventrally with two pointed setae, unequal in size ( Figure 8D). Length of IV-leg-4-6: 243, 251, 210. Swimming setae absent. Excretory pore surrounded by a small fringe of secondary sclerotization.

Male – Unknown.

Etymology — Named after the widely separated acetabula.

Discussion — Unlike all other Hygrobatides species, Cxgl-4 are not extending far anteriorly. Moreover, none of the known species have the acetabula so widely separated as in the new species and P2 with a blunt anteroventral projection.